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Drinking water treatment with ozone

Process description

Ozone is used for the chemical oxidation of problematic, refractory substances, such as humic acids or persistent pesticides. The molecule consisting of three oxygen atoms is one of the strongest oxidising agents, but is environmentally friendly and does not form chlorinated by products. However, ozone is unstable and is therefore only produced on site at the waterworks using ozone generators.

Gas application

In principle, ozone can be produced from atmospheric oxygen. However, production from pure oxygen achieves a much higher ozone concentration in the product gas and thus offers many advantages such as lower investment costs, lower energy consumption, higher efficiency of dissolution and smaller space requirement. The maintenance-intensive treatment and drying of compressed air is left out completely. The production of ozone from pure oxygen is thus more economical in medium and large plants and has further advantages, amongst others, with regard to drinking water quality. For these reasons, modern ozone generators are almost always operated with pure oxygen. Many older generators operating with air have already been upgraded to pure oxygen in order to take advantage of pure oxygen operation.

Advantages of ozone production from pure oxygen:

  • Lower investment costs
  • Lower annual costs
  • Compacter plant with lower space requirements
  • Plant and process are simpler and thus more robust 
  • Rapid dissolution and uniform distribution of ozone, improved water quality 

Messer solution

Messer provides the required supply of gaseous or liquid oxygen at the appropriate quality. Additionally, Messer offer test-facilites for process optimisation.